package com.wsh.scoket;

import com.wsh.utils.RedisUtils;
import com.wsh.utils.SpringContextHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Objects;
import java.util.concurrent.CopyOnWriteArraySet;

@Slf4j
@Component
@ServerEndpoint("/webSocket/{sid}")
public class WebSocketServer {

	// concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
	private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
	// 与某个客户端的连接会话，需要通过它来给客户端发送数据
	private Session session;
	// 接收sid
	private String sid = "";

	// 群发自定义消息
	public static void sendInfo(String message, @PathParam("sid") String sid) {
		log.info("推送消息到 sid={}，推送内容 message={}", sid, message);
		for (WebSocketServer item : webSocketSet) {
			try {
				//这里可以设定只推送给这个sid的，为null则全部推送
				if (sid == null) {
					item.sendMessage(message);
				} else if (item.sid.equals(sid)) {
					item.sendMessage(message);
				}
			} catch (IOException ignored) {
				log.error("WebSocket 消息推送异常 IOException={}", ignored.getMessage());
			}
		}
	}

	/**
	 * 连接建立成功调用的方法
	 * @param session
	 * @param sid
	 */
	@OnOpen
	public void onOpen(Session session, @PathParam("sid") String sid) {
		this.session = session;
		//如果存在就先删除一个，防止重复推送消息
		for (WebSocketServer webSocket : webSocketSet) {
			if (webSocket.sid.equals(sid)) {
				webSocketSet.remove(webSocket);
			}
		}
		webSocketSet.add(this);
		this.sid = sid;
		RedisUtils redisUtils = SpringContextHolder.getBean("redisUtils");
		redisUtils.set(sid, "logout");
		log.info("webSocket 成功建立连接 sid={}", sid);
	}

	/**
	 * 连接关闭调用的方法
	 */
	@OnClose
	public void onClose() {
		webSocketSet.remove(this);
		log.info("webSocket 关闭连接 sid={}", this.sid);
	}

	/**
	 * 收到客户端消息后调用的方法
	 * @param message
	 * @param session
	 */
	@OnMessage
	public void onMessage(String message, Session session) {
		log.info("收到来" + sid + "的信息:" + message);
		//群发消息
		for (WebSocketServer item : webSocketSet) {
			try {
				item.sendMessage(message);
			} catch (IOException e) {
				log.error("WebSocket 接收消息异常 Exception={}", e.getMessage());
			}
		}
	}

	@OnError
	public void onError(Session session, Throwable error) {
		log.error("发生错误");
		error.printStackTrace();
	}

	/**
	 * 实现服务器主动推送
	 * @param message
	 * @throws IOException
	 */
	private void sendMessage(String message) throws IOException {
		this.session.getBasicRemote().sendText(message);
	}

	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (o == null || getClass() != o.getClass()) {
			return false;
		}
		WebSocketServer that = (WebSocketServer) o;
		return Objects.equals(session, that.session) && Objects.equals(sid, that.sid);
	}

	@Override
	public int hashCode() {
		return Objects.hash(session, sid);
	}
}